Old English denn "wild animal's lair," from Proto-Germanic *danjan (source also of Middle Low German denne "lowland, wooded vale, den," Old English denu "valley," Old Frisian dene "down," Old High German tenni, German tenne "threshing floor," from PIE *dan- "low ground"). Sense of "small room" is 1771, originally colloquial.

1807, "to deprive of nationality," from French dénationaliser (said in contemporary English publications to have been coined by Napoleon Buonaparte; denapoleonize was coined shortly thereafter); see de- + nationalize. Meaning "to transfer from national to private ownership" recorded from 1921. Related: Denationalized; denationalization.

mid-18c., from Greek dendrites "of or pertaining to a tree," from dendron "tree," from PIE *der-drew-, from root *deru- "to be firm, solid, steadfast," also forming words for "wood, tree." The mineral so called for its markings.

1828, from West Indian Spanish dengue, from an African source, perhaps Swahili dinga "seizure, cramp," form influenced by Spanish dengue "prudery" (perhaps because sufferers walk stiffly and erect due to painful joints). The disease is African, introduced to the West Indies 1827.

French coin, early 15c., from Old French dener, a small coin of slight value, roughly equivalent to the English penny, in use in France from the time of Charlemagne to early modern times, from Latin denarium, from denarius, name of a Roman coin (source also of Spanish dinero; see denarius).

1690s, from French serge de Nîmes "serge from Nîmes," town in southern France. Application to "coarse cotton cloth" is first recorded 1850 in American English. Denims "pants made of denim" recorded from 1868. The place name is Roman Nemausus, said to be ultimately from Gaulish nemo "sanctuary."

1530s, "indication," from Late Latin denotationem (nominative denotatio), noun of action from past participle stem of denotare (see denote). As a term in logic, from 1843 (contrasted with connotation).

early 15c., from Middle French dense and directly from Latin densus "thick, crowded; cloudy," perhaps from PIE root *dens- "dense, thick" (source also of Greek dasus "hairy, shaggy"). Sense of "stupid" is first recorded 1822.

early 15c., from Middle French dénudation, from Latin denudationem (nominative denudatio), noun of action from past participle stem of denudare (see denude). Figurative use is from 1590s. In geology, from 1811.